STANDARD COMPETENCIES:

 

 1. Identify poor stopping, brake noise, air leaks, premature wear, pulling, grabbing, dragging, or balance problems caused by supply and

    service system malfunctions and/or foundation brake, slack adjuster, and brake chamber problems; determine needed action.

 2. Inspect air compressor drive gear, belts and coupling, inlet, oil and coolant lines, fittings, and mounting brackets, air system lines, hoses,

    fittings, and couplings; adjust or replace as needed.

 3. Inspect and test air system pressure controls (governor, unloader assembly valves, filters, lines, hoses, and fittings) and air system safety

    controls (air tank relief (safety) valves, one-way (single) check valves, two-way (double) check valves, manual and automatic drain valves)

    adjust or replace as needed.

 4. Inspect and clean air drier systems, filters, valves, heaters, wiring, and connectors; repair or replace as needed.

 5. Inspect and test brake application (foot/treadle) valve, hand brake (trailer) control valve, brake relay valves, quick release,

    tractor protection valves, emergency (spring) brake control/modulator valve(s), lines, fittings, and mounts; check pedal operation; replace as needed

 6. Inspect and test low pressure warning devices, stop light circuit switches, wiring, and connectors; repair or replace as needed.

 7. Inspect and test air pressure gauges, lines, and fittings; replace as needed.

 8. Inspect and test service brake chambers, parking (spring) brake chambers, diaphragm, seals, clamp, spring, pushrod, clevis,

    and mounting brackets; repair or replace as needed according to local regulations.

 9. Identify type, inspect and service slack adjusters; perform needed action.

 10. Inspect camshafts, tubes, rollers, bushings, seals, spacers, retainers, brake spiders, shields, anchor pins, and springs; replace as needed.

 11. Inspect, clean, and adjust air disc brake caliper assemblies; determine needed repairs.

 12. Inspect and measure brake shoes, pads, drums, and rotors; perform needed action.

 13. Inspect and test parking (spring) brake application, release valves, check valves, lines, hoses, and fittings; replace as needed.

 14. Manually release (cage) and reset (uncage) parking (spring) brakes in accordance with manufacturers’ recommendations.

 15. Identify and test anti compounding brake function.

 16. Observe and diagnose antilock brake system (ABS), ABS electronic controls and components, automatic traction control (ATC)

    warning light operation (includes dash mounted trailer ABS warning light), ATC electronic controls and components; using self-diagnosis

    and/or specified test equipment (scan tool, PC computer); determine needed action.

 17. Identify poor stopping and wheel lock-up problems caused by failure of the antilock brake system (ABS); determine needed action.

 18. Test and check operation of antilock brake system (ABS) air, hydraulic, electrical, and mechanical components; perform needed action.

 19. Test antilock brake system (ABS) wheel speed sensors and circuits; adjust or replace as needed.

 20. Verify power line carrier (PLC) operations.

 

 TOPICAL OUTLINE:

 

 I. Air Brake Air Supply Systems

     A. Compressors and Governors

     B. Reservoirs

     C. Valves, Lines, and Fittings

     D. Gauges and Low Air Pressure Warning Circuits

     E.  Alcohol Evaporators and Injectors

     F.  Air Dryers

 II. Air Brake Service Brake Systems

     A. Brake Application Valves

     B. Single Check Valves

     C. Double Check Valves

     D. Quick Release Valve

     E. Service Brake Relay Valves

     F. Limiting Valve

     G. Limiting Quick Release Valve

     H. Pressure Protection Valves

     I. Pressure Reducing Valves

     J. Inversion Valves and Safety Actuator Design

     K. Inversion Valve and Safety Actuator Operation

     L. Trailer Service Brake Systems

 III. Park, Emergency, and Complete Air Brake Systems

     A. Parking Brake Components

     B. Trailer and Converter Dolly Air Brake Systems

 IV. Air Brake Mechanical/Foundation Systems

     A.  Cam Brakes

     B.  Slack Adjusters

     C.  Brake Chambers

     D.  Wedge-Type Brakes

     E.  Wedge Brake Chamber

     F.  Air Disc Brakes

     G.  Air-Hydraulic Brake Systems

 V. Antilock Brake Systems

    A. Antilock Brake System Components

    B. Truck and Tractor Antilock Brake System Configurations

    C. Antilock Brake System Operation, Combined ECU, Modulator Valve, and Service

    D. Antilock Brake System Operation, Individual Modulator Valves

    E. Antilock Brake System Operation, Skid Pressure Sensitive Valve

    F. Antilock Brake System Warning Light